Short summary: nothing worked.
Comments: the problem is with the ISP; for some reasons it connects at
lower speeds when I use 56k modem than with the 28,8k modem. I am not
sure how they know, probably, the tetragrammatone LAPM has something
to do with it.
Retrains really slow down the connection badly (I get about 1kB/s
without retrains, down to 200 B/s if a retrain request occurs. Used
ati5 after disconnect to find out).
The commands at&Un and at&Nn do not change the connect speed; the modem
simply hangs up if the speed proposed from the other end is not within
the limits. In my case, I never got CONNECT if I used any of these
commands (with any nonzero parameters).
So I am out looking for a better ISP (not too many in Mexico D.F. AFAIK;
Prodigy maybe).
Thank you for your responses, and my best regards,
Oleg
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